Generally if the fuge/sump is below the display tank, there is no need for a pump to move water down. Rather, this is what your overflow does, be it a true overflow or a siphon of some sort. It will only flow as fast as your return pumps move water back up. You can plumb your fuge almost any way you like, the main thing to me is that you don't want an absurd amount of flow moving through it. You can see (and saw last weekend) how my fuge is supplied from a T on my main return pipe. It's only about 1/4 open.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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